Reverse String Without Libraries

MediumPython

Problem

How would you reverse a string without using libraries, and also change the first letter to uppercase and the last letter to lowercase?

Implement reverse_and_change_case(s) without using string slicing, reversed(), .upper(), or .lower(). Return the transformed string. Inputs contain ASCII letters only. For an empty string, return an empty string. For a one-character string, uppercase that character.

Input and Output

s is a string, and the function returns a string.

Constraints

0 <= len(s) <= 10^5
s contains ASCII letters only
Do not use string slicing, reversed(), upper(), or lower()

Function Signature

def reverse_and_change_case(s):

CodePython 3

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